Grafana Public Dashboard Query DoS via Unbounded JSON Size
CVE-2026-42127 Published on June 22, 2026
Pre-authentication denial of service in the public dashboard query endpoint
The public dashboard query endpoint does not limit request body size before processing, allowing unauthenticated attackers to trigger excessive memory allocation by sending arbitrarily large JSON payloads. This can lead to denial of service through memory exhaustion. No valid dashboard access token or authentication is required to exploit this vulnerability.
Weakness Types
What is a Resource Exhaustion Vulnerability?
The software does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.
CVE-2026-42127 has been classified to as a Resource Exhaustion vulnerability or weakness.
Allocation of Resources Without Limits or Throttling
The software allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor.
Products Associated with CVE-2026-42127
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Affected Versions
Grafana Enterprise:- Version 11.6.0, <= 11.6.14 is affected.
- Version 12.2.0, <= 12.2.8 is affected.
- Version 12.3.0, <= 12.3.6 is affected.
- Version 12.4.0, <= 12.4.3 is affected.
- Version 13.0.0, <= 13.0.1 is affected.
- Version 11.6.0, <= 11.6.14 is affected.
- Version 12.2.0, <= 12.2.8 is affected.
- Version 12.3.0, <= 12.3.6 is affected.
- Version 12.4.0, <= 12.4.3 is affected.
- Version 13.0.0, <= 13.0.1 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.